I need advice

Recently I have been troubled by something..... I had skip my classes for doing the revision and self study for upcoming test....but I only skipped classes in which they were doing revision for test... however my teacher a kind of scolded or ....advised me to not skip classes....the topics were taught long ago....I should have finished revision long ago....if I am doing it now...means I am slacking in my prep....I ..I admit what he said was true....but later he said....if I keep this going I will not be able to pass my entrance exam....when I heard that I was that ....I was upset...when his lecture happened today ....I was not able to concentrate in classs.and .....I was kept reminding of his scolding.....I used to like his classes ... But today I don't what happened?...is it my ego that is making me dislike his lecture?